Along with his congeniality, [he] displayed fine leadership qualities. With his well rounded personality, his enthusiasm, and his desire to do his best, Navy-Air is indeed getting an outstanding officer.

Mullen served as Company Officer and Executive Assistant to the Commandant of Midshipmen at the "U.S. Naval Academy. He also served in the "Bureau of Naval Personnel as Director, Chief of Planning and Provisions, Surface Officer Distribution and in the "Office of the Secretary of Defense on the staff of the Director, Operational Test and Evaluation. On the Chief of Naval Operations' staff, Mullen served as Deputy Director and Director of Surface Warfare and as Deputy Chief of Naval Operations for Resources, Requirements, and Assessments (N8["clarification needed]). He was the 32nd Vice Chief of Naval Operations from August 2003 to October 2004.

As Commander, Allied Joint Force Command "Naples, Mullen had operational responsibility for "NATO missions in the "Balkans, Iraq, and the "Mediterranean. As Commander, "U.S. Naval Forces Europe, he was responsible for providing overall command, operational control, and coordination of U.S. naval forces in the European Command area of responsibility. He assumed these duties on October 8, 2004, and was relieved of them upon his becoming "Chief of Naval Operations.

On October 29, 2006, the "Honolulu Advertiser published an "op-ed by Mullen that defined the concept of the 1,000-ship navy.[10] However Admiral "Gary Roughead, Mullen's successor as Chief of Naval Operations, rejected Mullen's concept in favor of a more inclusive vision that includes non-governmental organizations and cooperation with non-allied countries.[11]

On August 3, 2007, the U.S. Senate confirmed Mullen as the Chairman of the Joint Chiefs of Staff.[14] Mullen was sworn in on October 1, 2007. Upon taking office, Mullen became the first naval officer to hold the Chairman's position since Admiral "William J. Crowe, who served as Chairman prior to the enactment of the "Goldwater-Nichols Act in 1986, and who was the immediate predecessor to Army "general and later "United States Secretary of State "Colin Powell.

On March 18, 2009, Gates recommended to President "Barack Obama that Mullen be re-nominated for a second term as chairman of the Joint Chiefs.[15] He was unanimously confirmed by the Senate on September 25, 2009[16] and began his second term on October 1, 2009.

On February 2, 2010, Mullen and Gates said that they fully supported President Obama's decision to end the ""Don't ask, don't tell" policy, which prevented openly gay people from serving in the military. "It is my personal belief that allowing gays and lesbians to serve openly would be the right thing to do," Mullen said at a "Senate Armed Services Committee hearing. "No matter how I look at the issue...I cannot escape being troubled by the fact that we have in place a policy which forces young men and women to lie about who they are in order to defend their fellow citizens. For me, it comes down to integrity--theirs as individuals and ours as an institution."

During Mullen's Senate confirmation hearings for his first term nomination as Chairman of the Joint Chiefs of Staff, Mullen identified political progress in Iraq as a critical component of Iraq policy.[17] He noted that, "there does not appear to be much political progress" in Iraq.[17] He also said, "If [the Iraqis] aren't making progress in [the political] realm, the prospects for movement in a positive direction are not very good. Failure to achieve tangible progress toward [political] reconciliation requires a strategic reassessment."[17] Mullen further told the Senate that the United States needs to "bring as much pressure on [Iraq's political leaders] as [the U.S.] possibly can."[17]

Regarding the length and scope of the U.S. involvement in Iraq, Mullen told the Senate that while he does not envision permanent U.S. bases in Iraq, "vital interests in the region and in Iraq require a pragmatic, long-term commitment that will be measured in years, not months."[17]

President Obama, Secretary of Defense Panetta and Admiral Mullen provided the certification required by the Act to Congress on July 22, 2011. Implementation of repeal was completed 60 days later, so that "DADT was no longer policy as of September 20, 2011.

In a speech at Kansas State University,[18] Mullen outlined his views about the best application of military force in present times. He characterized most wars, such as World War II, as wars of attrition, where the reduction or elimination of enemy forces signaled victory. He characterized the Cold War as an issue of containment. In characterizing the current wars in "Iraq and "Afghanistan, he described them as "a fight against a syndicate of Islamic extremists led by al-Qaeda and supported by a host of both state and non-state actors", citing the border between Afghanistan and Pakistan as their "epicenter".

Mullen outlined three principles about the "proper use of modern military forces":

Military power should not be the last resort of the state: Mullen pointed to the readiness and capacity of military forces to respond to crises as reason to deploy them sooner, rather than later, in response. "We can, merely by our presence, help alter certain behavior."

Force should be applied in a precise and principled way: Mullen cites the sacrifice involved in deployment as requiring extreme care. Secondly, Mullen argues that "the battlefield isn't necessarily a field anymore. It's in the minds of the people." He cites General McChrystal's restriction of night raids as an example of this principle in action.

Policy and strategy should constantly engage with one another: Given that current engagements are open-ended, Mullen posits that military strategy must be more constantly engaged with policy. "...war has never been a set-piece affair. The enemy adapts to your strategy and you adapt to his." He cites the review process which led to the current Afghanistan escalation as a model of engagement between military leaders and policy makers.

President Obama nominated General "Martin Dempsey as the next chairman of the "Joint Chiefs of Staff on "Memorial Day 2011. Dempsey had only been sworn in as Army chief of staff the previous month. On September 30, 2011, Mullen officially retired from the military when his term as Chairman ended.

In December 2012, one year into his retirement, Mullen was in the news again, for having been the target of "computer hacking, a situation that led to subsequent "FBI investigations.[19] In 2013, Mullen joined the "board of "General Motors.[20]

On July 11, 2013, Mullen was put on the Board of Directors of "Sprint Nextel Corp directly after a buyout from "SoftBank, one of Japan's largest cellular companies.[21] In 2016, Mullen joined the Advisory Board of Afiniti, an American "unicorn big data and artificial intelligence business.[22]

As of December 2017, Mullen interview "Martha Raddatz "This Week United States did not solve of diplomatically and warns that "North Korea closer to a "Nuclear War with United States, he said in a statement,"We're actually closer, in my view, to a nuclear war with North Korea and in that region than we have ever been"[24][25]

Mullen is married to Deborah and together they have two sons, LT John Stewart Mullen, and LT Michael Edward Mullen, who also both attended the "Naval Academy and now serve as commissioned officers in the U.S. Navy.[26]

^ abcdefg"Statement of Senator John Warner"(PDF). Nominations of Adm. Michael G. Mullen, USN, for reappointment to the grade of Admiral and to be Chairman of the Joint Chiefs of Staff; and Gen. James E. Cartwright, USMC, for reappointment to the grade of General and to be Vice Chairman of the Joint Chiefs of Staff. Committee on Armed Services, US Senate. July 31, 2007. pp. 903–905. Retrieved June 11, 2011.